(Associated Press) A U.S. Border Patrol agent trying to stop a group of people suspected of crossing the Mexican border illegally shot and killed a man after being hit in the head with a rock, reigniting questions over whether the agency overreacts to such assaults by migrants and suspected smugglers.

The man, who threw the rock at the bottom of a 75-foot ravine, was pronounced dead at the scene after first-aid efforts failed, San Diego County sheriff’s Lt. Glenn Giannantonio said Tuesday.

The Border Patrol said in a statement that the agent feared for his life.

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